payload converter fixes

include/payload.h

@@ -15,7 +15,7 @@
 #define LPP_MSG_CHANNEL 28
 #define LPP_HUMIDITY_CHANNEL 29
 #define LPP_BAROMETER_CHANNEL 30
-#define LPP_GAS_CHANNEL 31 
+#define LPP_AIR_CHANNEL 31 
 
 #endif
 
@@ -66,8 +66,8 @@ private:
   void writeUint32(uint32_t i);
   void writeUint16(uint16_t i);
   void writeUint8(uint8_t i);
-  void writeHumidity(float humidity);
-  void writeTemperature(float temperature);
+  void writeFloat(float humidity);
+  void writeUFloat(float temperature);
   void writeVersion(char * version);
   void writeBitmap(bool a, bool b, bool c, bool d, bool e, bool f, bool g,
                    bool h);